Smooth animation transitions, single animation window. Interesting events; API support includes arrays and binary trees; applet interface for interaction. Examples in paper include Quicksort, bubble sort, AVL tree. Template class is provided, graphic interface for generation is “planned''. Areas: visualization area; text area (code with highlighting), UI area (play, pause, stop, rewind, by step / continuous) and speef control. “back'' restarts whole animation until next step = this step; random variables can be reassigned. Also offers “try'' mode with “check'' button.